<!DOCTYPE html>
<html lang=zh-CN>

<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width,user-scalable=no,initial-scale=1,maximum-scale=1,minimum-scale=1">
	<title></title>
	<style type="text/css">
		body {
			margin: 0;
			background-color: #f3f3f3;
		}

		iframe {
			width: 375px;
			height: 667px;
			background-color: #fff;
			box-sizing: content-box;
			border: none;
		}

		@media screen and (min-width: 450px) {
			iframe {
				position: fixed;
				top: 0;
				right: 0;
				bottom: 0;
				left: 0;
				margin: auto;
				border: rgba(0, 0, 0, 0.7) solid 10px;
				border-radius: 4px;
			}
		}
	</style>
</head>

<body>
	<iframe src="/"></iframe>
</body>

</html>